CARDINALITY_OPTIONS = (('OPT','0..1 - Optional'),
                       ('REQ','1 - Required'),
                       ('OPT-MANY','0..* - Optional: zero or more'),
                       ('REQ-MANY','1..* - Required: one or more'))

DATATYPE_OPTIONS = (('boolean', 'Boolean' ),
                    ('complex', 'Complex'),
                    ('datetime', 'Date/Time'),
                    ('double', 'Double precision'),
                    ('float', 'Single precision'),
                    ('int', 'Integer'),
                    ('long', 'Long integer'),
                    ('rational', 'Rational'),
                    ('short', 'Short integer'),
                    ('string', 'String or text'))
